An electronic device is provided. The electronic device comprises an interposer disposed between first circuit board and second circuit board, and including an opening area and for accommodating the at least one electronic component, and the interposer comprises a board including an inner surface that faces the opening area and an outer surface that faces an opposite direction to the inner surface, wherein the outer surface is formed in a convexo-concave form having a plurality of first concave areas and a plurality of first concave areas, and a side conductive member disposed on the first concave areas and the first concave areas of the outer surface, and formed along the convexo-concave form of the outer surface.